Just to follow up, I was able to use an amalgamation of this document:
https://arubanetworkskb.secure.force.com/pkb/articles/HowTo/R-124
and the document provided above:
https://arubanetworkskb.secure.force.com/pkb/articles/HowTo/R-154
to achieve my goals. The only adjustment I needed to make was in the html document provided in R-154 to adjust the form post action from:
<form name="form1" method="post" action="/auth/index.html/u">
to:
<form name="form1" method="post" action="https://<controllerIP>/auth/index.html/u">
And I additionally had to check the 'Guest Login' box in the Captive Portal configuration under L3 authentication to accomodate the HTML page provided in the R-154 example. Hope this helps someone and thanks for everyone's help!